I'd be inclined to the non adhesive backed - probably a lot easier to fold around the internal divider panel immediately behind the driver.
Of course the particular version of Ultratouch that I've been using for a couple of years now has a bonded fabric backing, so it's easy to glue on with white woodglue (Weldbond, etc) - which as it doesn't bond instantly, provides some working time to position the pads in place.
Of course the particular version of Ultratouch that I've been using for a couple of years now has a bonded fabric backing, so it's easy to glue on with white woodglue (Weldbond, etc) - which as it doesn't bond instantly, provides some working time to position the pads in place.
You're probably right about the adhesive backed being easier to work with. Maybe I'll try both when the time comes. If I could get 1/2" Ultratouch with the fabric backing, I would try it, but I have yet to find a US source for it. There is, as other posters have indicated, a 3/8" thick foil-backed denim-based product available from home improvement stores; I wonder if there would be a perceivable difference between the 3/8" thick vs. the 1/2" thick product. I would assume that if properly applied the foil is thin enough so as not to significantly reduce the critical dimensions or volume of the enclosure; as foil is non-porous however, I would also assume that rules out the use of any water-based adhesives (I'm recalling a time when, for aesthetics, I attempted to adhere copper foil to a shelving unit with water-based wallpaper adhesive--it was a travesty!)
Also, I have no empirical basis for suggesting that the F-13/15 grades are ideal for HF absorption other than manufacturer sites claiming their applications in "audio". It stands to reason that perhaps "looser" densities might work better in MLTL and folded horn applications if HF absorption is the intent. But the tensile strength, compression, hardness, vibration absorption, and abrasion resistance of "looser" F-26 plummets and there's probably a point of diminishing returns between F-15 and F-26.
Lastly, does anyone know if there is a concern about long-term deterioration due to moths with wool felt? I'm only half-joking! What are the resonant properties of mothballs?😉
Actually, my point was the opposite - at least for this case . PSA backed products are fine for flat surfaces with easy access, but the FH3 was mentioned - a design of which I've built a few pairs. There are a couple of areas that require manipulation of the damping pads in rather tight quarters around the internal divider, and think it'd be too easy for the adhesive to stick before cut pieces were accurately in place.
As for the foil backed products, white PVA glues, particularly those types formulated for Melamine ( Wilsonart and Roo are commercial examples) should work just fine.
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